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1094 Views 0 Replies Last post: Jun 22, 2012 12:32 PM by awillkey RSS
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Jun 22, 2012 12:32 PM

Are butterfly wings always symmetrical?

I recently discovered the site of some de Prunner's Ringlets (central Spain) but when I looked at my photos there was one ragged specimen that looked different so I returned to do more investigation. This time I found a specimen that was not obviously ragged but was not de Prunner's (see attached photo). I think it is a Piedmont. However, the reason for the question is that the wings appear not to be symmetrical. I assume (and maybe this is where my logic falls down) that the locations of spots on the under surface of a wing correspond to the locations of spots on the upper surface. If you look at the apical spots on the upper surface of the wing further from the camera the line through them clearly is sort of parallel to the outer margin.

 

non-symmetric wings.JPG

 

On the other hand, a line through the two apical spots on the under surface of the wing closest to the camera clearly is not. So what is going on here? (And if anyone has an opinion on whether this is a Piedmont I'd like to hear that too.)

 

Alan


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